depends...If you have a stomach ache and vomity feeling..or loose motion you can do a simple exercise....

Stand straight with hands raised....keep a little distance between legs and now first slowly bend to touch the floor between your feet....repeat it a little fast (not tooo fast)...

you should do this first thing in morning after the normal chores...and eat something after the exercise...this is specially for people who get the stomach ache when lifting something heavy or playing...